Redis- Database operation command

DBSIEZ returns the number of key-value pairs the database currently contains
```
18 127.0.0.1:6379 > dbsize (integer)Copy the code
```
FLUSHDB deletes all key/value pairs in the current database. The command always returns OK, indicating that the deletion is successful
```
127.0.0.1:6379> flushdb
OK
127.0.0.1:6379> dbsize
(integer) 0
Copy the code
```
FLUSHALL deletes all key-value pairs from all databases contained by the Redis service

FLUSHDB FLUSHALL

The current DB All the DB
Mysql > SELECT num from redis; mysql > SELECT num from redis; mysql > SELECT num from redis; Key-value pairs in one database have no effect on key-value pairs in another database
```
127.0.0.1:6379> select 1
OK
127.0.0.1:6379[1]> 
Copy the code
```
MOVE Key target-db Moves the key in the current database to the target database target-db. If the MOVE succeeds, 1 is returned; if the MOVE fails, 0 is returned. If the key already exists in the target database or does not exist in the current database, no operation is performed
```
127.0.0.1:6379> set msg hello
OK
127.0.0.1:6379> move msg 1
(integer) 1
127.0.0.1:6379> move msg1 1
(integer) 0
127.0.0.1:6379> select 1
OK
127.0.0.1:6379[1]> get msg
"hello"
127.0.0.1:6379[1]> get msg1
(nil)
Copy the code
```